def test_ref_pyqt():
backend_ref('pyqt')
def test_ref_wx():
backend_ref('wx')
def test_ref_imagemagick():
backend_ref('imagemagick')
def test_ref_gnome_screenshot():
backend_ref('gnome-screenshot')
def test_ref_pyside():
backend_ref('pyside')
def test_ref_pygdk3():
backend_ref('pygdk3')
def test_ref_pygtk():
backend_ref('pygtk')
def test_ref_pyqt5():
backend_ref('pyqt5')
